The study of the skin and related diseases are the object of analysis of a specific branch of Medicine: dermatology.
Beyond the concern that sudden skin spots may cause, it is best to have a dermatologic checkup for moles (snow mapping) once a year. In fact, through the support of the dermatoscope, the dermatologist is able to detect any skin neoformations that need to be removed because they are possible manifestations of disease. In fact, mole mapping is one of the main tools for early detection of melanoma.
To undergo an accurate mole check (snow mapping), it is necessary not to be tanned, not to wear makeup, and not to have nail polish of any kind on your toenails and fingernails.